In November, Massachusetts voters approved the legalization of marijuana.
How that will be regulated, taxed and implemented is still up for debate on Beacon Hill. You can read more about that here:
Marijuana toxicity is well documented in dogs. It causes neurologic symptoms including inability to walk, depression, stupor, coma and death. Edibles, given the higher concentration of THC in these products, have been implicated in serious cases of marijuana toxicity in dogs.
But can it help treat chronic pain? Cancer? Check out this article from the Sacramento Bee discussing some of the legal and ethical implications regarding marijuana use in pets: